Answer:
W' -6,2
X' -12, 2
Y' -10, -3
Z' -4, -3
Explanation:
If you look into a mirror, you will see your reflection. It's kind of like that ig. Reflecting it over the y-axis means that you're going to be moving the whole shape over the line that says "y" at the top of it. Sorry if my explanation is bad, but this is the most easy way for me to explain it. After you reflect it over the y-axis, you have to find out where the points are now.
So
Point W started at 6,2
Point X started at 12,2
Point Y started at 10,-3
Point Z started at 4,-3
Btw, I just started learning this, so I may be wrong, but I hope this helped!!